S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

Photo: What is this switch?

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Old 01-19-2015, 12:21 PM
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Photo: What is this switch?

See the switch in the red circle. My guess was a rear fog light, but it's pointing in the wrong direction and the rear fog, AFAIK, is on the dial.

I'd appreciate info on the switch. Thanks.



BTW, I'm currently driving an E38 BMW 750iL (V12) and working on buying a 13 W221 4Matic w/ Night View, B&O, Splitview, rear package, etc. I'm hoping I'm making a good decision....

Edit: The photo above is not from the vehicle I'm considering.
Old 01-19-2015, 12:33 PM
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I believe thats the headlight washer button.
Old 01-19-2015, 12:37 PM
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Originally Posted by Quadcammer
I believe thats the headlight washer button.
If that's correct it's been removed for 2010+ and its a pain in the *** to use.
Old 01-19-2015, 12:45 PM
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Originally Posted by Quadcammer
I believe thats the headlight washer button.
Originally Posted by Jason B
If that's correct it's been removed for 2010+ and its a pain in the *** to use.
Ah, that could very well be. I was reading the manual on the 2013 and the washer is automatic. It comes on during certain conditions.

Thanks for your replies.
Old 01-19-2015, 12:49 PM
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If that's true, they've never come on automatic. How it works for 2010+ is you have to hit the washer button for the front windshield like 5 times in a row to make the headlight washer pop up which are a useless waste of money anyway. They should have an actual wiper on the headlights and washer, ala w140
Old 01-19-2015, 12:54 PM
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Originally Posted by Jason B
If that's true, they've never come on automatic. How it works for 2010+ is you have to hit the washer button for the front windshield like 5 times in a row to make the headlight washer pop up which are a useless waste of money anyway. They should have an actual wiper on the headlights and washer, ala w140
Yeah you're right. Weird setup.

I looked at the 2009 manual and that button is already gone. I then looked at 2007, and it is in fact the headlight washer button....
Old 01-19-2015, 01:00 PM
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Originally Posted by Jason B
If that's true, they've never come on automatic. How it works for 2010+ is you have to hit the washer button for the front windshield like 5 times in a row to make the headlight washer pop up which are a useless waste of money anyway. They should have an actual wiper on the headlights and washer, ala w140
I'd like it if when I pressed the button a little door on the bumper pops open and a tiny man in a window washer's costume washes the headlamps using a miniature scaffold rig. WTF Mercedes? The current system is barbaric.
Old 01-19-2015, 01:05 PM
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I have an 07 and love having that option available. Not sure why they removed it on the newer w221's, or made it a more difficult option to use. Hopefully on the W222's they added it back in.
Old 01-19-2015, 01:59 PM
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I prefer having a button vs. automatic.
Old 01-19-2015, 02:01 PM
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I've accidentally hit it a few times in my 07 CL and it shoots cleaner fluid all over the hood of the car. Totally useless imo.
Old 01-19-2015, 02:59 PM
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Originally Posted by mynamesjson
I've accidentally hit it a few times in my 07 CL and it shoots cleaner fluid all over the hood of the car. Totally useless imo.
agree its useless, but if it comes on every "x" number of times you use the wipers, you may get washer fluid sprayed over your freshly cleaned car.

The button at least gives you control and the ability not to use it if you don't want it.
Old 01-19-2015, 03:13 PM
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The headlight washer switch was only available on the 2007 W221. In 2008, it went to an automatic setup. I'm much happier having control over when it's turned on....vs every couple of window wash cycles. When I had my M5, I programmed the headlight washers off completely.
Old 01-19-2015, 07:25 PM
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Yea. It won't come on unless you hit the washer stalk 5 times (in a row) with no waiting. If you hit it once, then 10 min later again, then again, then again, it won't come on. I tried this with a friend and that's how it is, if I remember. Now, what else is dumb, is when it activates, you have no idea, unless u are standing in front if the car. You can't hear it while driving. You should at least get a light or warning notification on command telling you they activated. At least this way you'll know you need a car wash as soon as your home - from the mess they leave behind.

(I can't remember if its 3 times in a row or 5 to activate)
Old 01-19-2015, 07:36 PM
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I have the swith beside the headlight.....on my 07'.

I've trued it once......while driving and all it did was spray washer fluid on my hood (which left stains as it was a hot day). Tried it once when I was stationary, less spray on the hood.

Don't think I'll ever use it again.
Old 03-16-2015, 01:37 PM
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I encourage you all not to use the headlight washer function



What a mess (that's what she said...)
Old 03-16-2015, 01:39 PM
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Originally Posted by Jason B
I encourage you all not to use the headlight washer function

What a mess (that's what she said...)
Cool to see that little thing pop out though. Oh. Wait. That's what she said too...

Last edited by snovvman; 03-16-2015 at 01:46 PM.
Old 03-16-2015, 08:32 PM
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Come on Mike. You HAVE to have a thought about the post two above.

I rather like the 10 times the headlight washer works. Down here in the south, we almost never use it. But, if you are driving in snow/salt/ice conditions, you are hitting the wipers dozens of times an hour. I think that is what it was designed for.

The little mechanical wiper was subject to rock hits, massive bug collections, not to mention all of the other crap that comes up from the road. How effective where they at cleaning the headlight lens? I question that.

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